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What is AQI?

The AQI is an index for reporting daily air quality. It tells you how clean or polluted
your air is, and what associated health concerns you should be aware of. The AQI
focuses on health effects that can happen within a few hours or days after breathing
polluted air. EPA uses the AQI for five major air pollutants regulated by the Clean
Air Act: ground-level ozone, particulate matter, carbon monoxide, sulfur dioxide,
and nitrogen dioxide. For each of these pollutants, EPA has established national
air quality standards to protect against harmful health. (EPA-454K-03-002, August
2003, http://www.airnow.gov/)

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